Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c88673549eef6f6…

MALICIOUS

PDF

88.9 KB Created: 2021-08-10 16:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbb689dd0ee38dd44ff96ec4269a31b6 SHA-1: fba80d3383d2ebaadd55d4f9d1a6fb705ac510f8 SHA-256: 2c88673549eef6f601f8d314eee4f0b74596b57ad8fff5be65925299f12925f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The primary purpose seems to be redirecting users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=space+shooter+galaxy+attack+mod+apk+latest+version PDF link annotation
    • http://hasici-pristroje-eshop.cz/files/file/nuzet.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba05a40fb520031205732ca1efc990fa/xotadexofuzapixupi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/74465985359.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210712092723.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hjvgc64ttq594l4inoq8atu4ig/luvedanobeluxijoxagipigob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/58920008614.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/zovakizi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/4148867608.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a6cf4e4231dc91f93d4bdb0a2290a5ff/1805896474.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8b203d27cf0104717ec4e82987fa0782/37240917401.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d59b040b---jigoru.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/86500701836.pdfIn PDF document text
    • https://termoformat.md/img/files/kulujamipowukelupesikip.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/taganoditekumotutanofuvi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/43586306083.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097a9cc72952---fanejumagiz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/607db161b4bbc38fc1e27807066eddef/69815302050.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef9f484d2c---bojenavobizebe.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/26870385567.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/98576801212.pdfIn PDF document text
    • http://indecomavo.pl/inc/muzaku.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/rigudofimetazorex.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fd6b5548---zenorop.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/27889986191.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 17132 bytes
SHA-256: 3e1a6e662fb15e0eb095254cb4ec7534d7b648e06aed0d76856c8d5339a3920f
font_01_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 11412 bytes
SHA-256: 183ee844f1bdaeb09763c10e1da4d263f61ca5c5bdb9177489eb09c625b0074c

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